[15.0, 13.0] Journal items lines disappear on vendor bill when changing analytic account.

[pablohmontenegro]

Impacted versions: 15.0, 13.0

Steps to reproduce:

1. Create a vendor bill with 2 invoice lines.
2. Set in the first invoice line an analytic account and set 2 taxes, for example:
   Tax 15% --> setting: (Tax Computation: Percentage of Price, Tax Scope: Purchases, Amount: 15,0%)
   Percepcion IVA Sufrida (create this tax) --> setting: (Tax Computation: Fixed, Tax Scope: Purchases, Amount: 1.0 . Advanced Options --> select the option "Include in Analytic Cost")
3. Set in the second invoice line the same analytic account as the first line and set 1 tax, like this one:
   IVA Compras No Gravado (create this tax) --> setting: (Tax Computation: Fixed, Tax Scope: Purchases, Amount: 0.0 . Advanced Options --> select the option "Include in Analytic Cost")
4. Go to the page "Journal Items" in the vendor bill and change the analytic account of the line with the label "Percepcion IVA Sufrida". After that, the line will disappear.

Current behavior:

Some lines on the page "Jornal Items" in a vendor bill disappear when changing the analytic account.

Expected behavior:

Not disappear lines on the page "Jornal Items" in a vendor bill when changing the analytic account.

Video/Screenshot link (optional):

https://drive.google.com/file/d/1slfF3ahohPJkzUHJUv_XwBcdTkWC29oP/view

Support ticket number submitted via odoo.com/help (optional):
#2957345